Serving tray unit



FIG. 1 is a front or rear elevational view of a serving tray unitshowing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side being amirror image thereof;

FIG. 5 is a top front perspective view thereof; and

FIG. 6 is a top rear perspective view of a modified form of my newdesign of FIGS. 1-5.

The ornamental design for a serving tray unit, as shown and described.